Siemens SITRANS P500, Руководство по эксплуатации, Страница: 165 / 238

Operate
6.3 Description of the operating functions
SITRANS P500 with HART
Operating Instructions, 12/2014, A5E02344528-09
165
As long as the warning/alarm limit has not been reached, the following applies:
1.
"Reset the timer" this resets the timer, which then restarts from 0. The monitoring remains
active.
2. "Alarm/Acknowledge the request" this has no effect; the timer continues to run and the
monitoring remains active.
When the warning/alarm limit has been reached, the following applies:
1.
"Alarm/Acknowledge the request" resets the request / alarm message, but allows the
timer to continue to run. In this state, a new alarm or warning is not possible since the
time limits have already been exceeded.
2. "Reset timer" resets the request / alarm message, also resets the timer. It acknowledges
the interrupt or warning at the same time. The timer immediately starts running again from
zero and will report again when the warning/alarm limit is next reached. The next
calibration interval is therefore immediately active.
See also
"3.5.1.6 Acknowledge/Reset" (Page 127)
"3.5.2.6 Acknowledge/Reset" (Page 129)
"3.5.1.5 Warn.-Alarm active" (Page 127)
"3.5.2.5 Warn.-Alarm active" (Page 129)
6.3.11.2 Min/max indicator
Description
The pressure transmitter offers four pairs of min./max. pointers in a redundant arrangement.
The min/max indicator pairs are used to monitor the four measured variables pressure, static
pressure, sensor temperature and electronics temperature for negative and positive peak
values. Each measured value maintains a saved min./max. pointer to record the long-term
maximum and minimum peak values and the times when they occurred. If the value is for
pressure or static pressure, the sensor temperature is also saved. Consequently, the values
are available even after the device is restarted. The resettable min./max. pointers are even
updated during a simulation, in this case non-resettable updates are performed only for the
process variables that actually prevail.
The pressure transmitter contains both resettable as well as non-resettable min./max.
pointers.